Sandbook: Natural Voice Reader

Sandbook: Natural Voice Reader

Text to Speech, Read Aloud TTS

20 ratings
18 reviews
$0.99 Free

Price history


Details

  • Released
  • Updated
  • May 18, 2025
  • December 27, 2025

Features

Sandbook: Natural Voice Reader video #1 for iPhone
Sandbook: Natural Voice Reader screenshot #2 for iPhone
Sandbook: Natural Voice Reader screenshot #3 for iPhone
Sandbook: Natural Voice Reader screenshot #4 for iPhone
Sandbook: Natural Voice Reader screenshot #5 for iPhone
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About

This app converts text into natural-sounding speech using an on-device model. Read ePub, PDF, and TXT files, type or paste text, or even read webpages aloud. Export audio files for offline listening with complete privacy.

On-device text-to-speech
Reads ePub, PDF, TXT files
Type or paste text
Read webpages aloud
Export audio files
Privacy protection
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What's New in Sandbook

1.0.2

December 27, 2025

New Features - Text Mode: Type or paste text directly to have it read aloud. Bug Fixes - Improved web page content extraction accuracy - Fixed character encoding for special characters - Fixed audio skipping at chapter end - Fixed play/pause button state sync - Resolved audio gaps between paragraphs

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User reviews

Great voice, struggles with prosody

The voice itself is great. It sounds very human. But it struggles with pronouncing certain things and where to pause in sentences and phrases. The PDF I fed it had the word clothing split between two lines with a between CLOTH on first line and ING on second line. It pronounced it as two words instead of one. Another example is the words great apes. It pronounced it “gray-it ai-ips.” The word laid was pronounced “lay-id.” It also pauses at the end of every line for as long as at the end of every song entrance, making the reading choppy. The funniest was when humans was split between lines as hu-mans and it pronounced it “who” pause “mans.”

Would love using the voice, if the reading flowed and pronunciation improved!
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Feedback

Phenomenal, wish there was a built in dictionary too.

Strange/Foreign Pronunciations 🙅‍♂️, but Human-Sounding 👍

The speech started off sounding so surprisingly *normal*/acceptable (which is above par for local iOS TTS). And then it reached the many words in the source text that include -eight (eight, weight) instantly revealed that all voice/region variants apparently come from one distinctively unusual/foreign source.
It would be great if we could train/adopt new voices based on voice recordings (voice cloning).
Continuing to avoid using this for now.
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Incredible piece of software

As per the title I’m staggered that text to speech with Kokoro to now run on an iPhone and this piece of software coming out free is a brilliant GUI wrapper, really grateful for the developers work

Simply incredible

Thank you so much for building this

Developer apps

FAQ

Why doesn't Sandbook support background/screen-off reading?

Sandbook utilizes a large on-device model that requires significant GPU/VRAM. Apple's policies prohibit apps using high GPU/VRAM from running in the background.

Is it normal for my phone to heat up or crash when using Sandbook?

Heating up is normal due to the app's GPU utilization. Crashing may occur on devices with low memory (3GB or less), such as older iPhone models.

What languages does Sandbook support?

Sandbook currently supports English (US/UK) voices, offering both male and female options with natural pronunciation and intonation.

How does Sandbook protect my privacy?

All your data remains on your device and is never sent to the cloud or shared externally, ensuring complete privacy protection.

What file formats can Sandbook read?

Sandbook can read ePub, PDF, and TXT files, allowing you to listen to your documents with natural-sounding voices.

Can I export audio from Sandbook?

Yes, you can generate short speech samples and export them for further use, making it convenient for creating audio content.

What is the update frequency for Sandbook?

The app was last updated on 2025-12-27, indicating active development and support.

What devices is Sandbook compatible with?

Sandbook is available for iPhone and iPad, running on iOS.